/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineExternalUIInterface.h
Display the platform UI for browsing available products for purchase
true if it was able to show the UI, false if it failed
bool ShowStoreUI ( int32 LocalUserNum, const [FShowStoreParams](API\Plugins\OnlineSubsystem\Interfaces\FShowStoreParams) & ShowParams, const [FOnShowStoreUIClosedDelegate](API\Plugins\OnlineSubsystem\Interfaces\FOnShowStoreUIClosedDelegate) & Delegate )